From 8ffbc2df0fde83082610149d24e594c1cd879f4a Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 20 Feb 2017 00:05:25 -0800
Subject: Import Upstream version 2a6

---
 scmacro.scm | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 scmacro.scm

(limited to 'scmacro.scm')

diff --git a/scmacro.scm b/scmacro.scm
new file mode 100644
index 0000000..47bafca
--- /dev/null
+++ b/scmacro.scm
@@ -0,0 +1,119 @@
+;"scmacro.scm", port for Syntactic Closures macro implementation -*- Scheme -*-
+;Copyright (C) 1992, 1993, 1994 Aubrey Jaffer
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+;;;; Syntaxer Output Interface
+
+(define syntax-error slib:error)
+
+(define impl-error slib:error)
+
+(define (append-map procedure . lists)
+  (apply append (apply map (cons procedure lists))))
+
+(define *counter* 0)
+
+(define (make-name-generator)
+  (let ((suffix-promise
+	 (make-promise
+	  (lambda ()
+	    (string-append "."
+			   (number->string (begin
+					     (set! *counter* (+ *counter* 1))
+					     *counter*)))))))
+    (lambda (identifier)
+      (string->symbol
+       (string-append "."
+		      (symbol->string (identifier->symbol identifier))
+		      (promise:force suffix-promise))))))
+
+(define (output/variable name)
+  name)
+
+(define (output/literal-unquoted datum)
+  datum)
+
+(define (output/literal-quoted datum);was output/constant (inefficient)
+  `(QUOTE ,datum))
+
+(define (output/assignment name value)
+  `(SET! ,name ,value))
+
+(define (output/top-level-definition name value)
+  `(DEFINE ,name ,value))
+
+(define (output/conditional predicate consequent alternative)
+  `(IF ,predicate ,consequent ,alternative))
+
+(define (output/sequence expressions)
+  (if (null? (cdr expressions))
+      (car expressions)
+      `(BEGIN ,@expressions)))
+
+(define (output/combination operator operands)
+  `(,operator ,@operands))
+
+(define (output/lambda pattern body)
+  `(LAMBDA ,pattern ,body))
+
+(define (output/delay expression)
+  `(DELAY ,expression))
+
+(define (output/unassigned)
+  `'*UNASSIGNED*)
+
+(define (output/unspecific)
+  `'*UNSPECIFIC*)
+
+(require 'promise)			; Portable support for force and delay.
+(require 'record)
+(require 'synchk)			; Syntax checker.
+
+;;; This file is the macro expander proper.
+(slib:load (in-vicinity (library-vicinity) "synclo"))
+
+;;; These files define the R4RS syntactic environment.
+(slib:load (in-vicinity (library-vicinity) "r4rsyn"))
+(slib:load (in-vicinity (library-vicinity) "synrul"))
+
+;;; OK, time to build the databases.
+(initialize-scheme-syntactic-environment!)
+
+;;; MACRO:EXPAND is for you to use.  It takes an R4RS expression, macro-expands
+;;; it, and returns the result of the macro expansion.
+(define (synclo:expand expression)
+  (set! *counter* 0)
+  (compile/top-level (list expression) scheme-syntactic-environment))
+(define macro:expand synclo:expand)
+
+;;; Here are EVAL, EVAL! and LOAD which expand macros.  You can replace the
+;;; implementation's eval and load with them if you like.
+(define base:eval slib:eval)
+(define base:load load)
+
+(define (synclo:eval x) (base:eval (macro:expand x)))
+(define macro:eval synclo:eval)
+
+(define (synclo:load <pathname>)
+  (slib:eval-load <pathname> synclo:eval))
+
+(define macro:load synclo:load)
+
+(provide 'syntactic-closures)
+(provide 'macro)			;Here because we may have
+					;(require 'sc-macro)
-- 
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